you must listen a lot, always, when you're in the bus, metro, university, home. Read books, and if there's possibility, read aloud to make sure you hear what you read. Do this all the time, and it'll be ok.

To improve your English speaking skills, you should try to speak in English with your friends, teachers and all of your surrounding people with which you can comfortably make conversions in English. You can also take help from online English courses. These courses are very helpful in English learning.